I acquired an old Quincy, model 325 two stage air compressor that is about 50 years old. It does run. I would like to find out what the various copper tubes do (one disconnected), what the various parts are and how to restore the connections. The pressure regulator has been disconnected, I'm trying to figure out how it works. One tube goes from the lower crankcase to the top of the compressor. Quincy sent me some pictures but no parts names or connection info. Thanks for any help. Johnny

I have a picture of the compressor with the motor removed, tubes and piping also. I'm sandblasting the unit and repainting it. When I get it more assembled, I'll be able to send additional picts. The tag on the tank says it was assembled in 1953. The tank is a Weaver, compressor is Quincy, the motor was replaced in 1993 with the present 5 HP, it draws 31 amps. Previous owner sand the motor has very little use. I'm new to any forum and sending picts, so bear with me if it doesn't go thru the first time. John

How old is the tank? If it is original I would STRONGLY recommend having it hydo tested or even replaced. Corrosion in an old tank can be dangerous although most often it starts leaking first and usually, but not always, does not become too dangerous unless someone attempts to repair it which should never be done. The biggest problem with a really old tank is that it most likely has gone though so many charge/discharge cycles that the metal has fatigued from the expansion and contraction that normally occurs and basically it reaches the end of it's service life. This metal fatigue can be vary dangerous and when a tank fails under those circumstances it is more likely to do so violently, if that tank is 1953 model I personally would not even consider using it for safety reasons. I really like these old compressors and I know of a couple more as old as mine that the owners have used for many years and treasure them as much as I do mine. I have seen some old Quincy's that had absolutely unbelievable service time on them and still being used every day! One in particular has worn out two gas engines and a couple of tanks but that was during the THIRTY years the guy used it on his service truck(s) at the mines and this was doing regular duty, he has done nothing but regular service to this old pump which has since been retired but still does occasional duty in his home garage. Darn right I like those old Quincy's!

The tube from the "bottom" goes to the unloader actuator on top of at least one cylinder valve. The open connection goes to the receiver and the valve operates to open to route pressure to the air operated unloader when the compressor stops and oil pressure falls below setpoint. This way the compressor starts unloaded and also unloads the cylinders when it stops.

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.

Email Address:

Insurance

Please select your insurance company (Optional)

Log-in

User Name

Remember Me?

Password

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.